Unlike the USB-C AltMode handling and unlike the DP controller handling the HPD on its own, if the display-connector is being used to handle the HPD pin, DP controller might not be able to get either the HPD notification nor detect the cable state if the cable is plugged in before the system has booted.
Make the display-connector send the HPD notifications during system startup for DisplayPort connectors. It's typically not a problem for other types of display connectors since there is no special procedure to detect if the monitor is actually plugged in or not. Signed-off-by: Dmitry Baryshkov <[email protected]> --- Changes in v2: - Expanded commit message, explaining difference from HDMI (Laurent) - Link to v1: https://lore.kernel.org/r/[email protected] --- Dmitry Baryshkov (2): drm/bridge: display-connector: don't autoenable HPD IRQ drm/bridge: display-connector: trigger initial HPD event for DP drivers/gpu/drm/bridge/display-connector.c | 36 ++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) --- base-commit: e98d21c170b01ddef366f023bbfcf6b31509fa83 change-id: 20260314-dp-connector-hpd-f069e66bc6af Best regards, -- With best wishes Dmitry
